<template>
  <div>
    <!-- 顶部滑动条区域 -->
    <div id="slider" class="mui-slider">
      <div
        id="sliderSegmentedControl"
        class="mui-scroll-wrapper mui-slider-indicator mui-segmented-control mui-segmented-control-inverted"
      >
        <div class="mui-scroll">
          <a
            :class="['mui-control-item',item.id == 0 ? 'mui-active' : '']"
            v-for="item in cates"
            :key="item.id"
            @tap="getPhotoListByCateId(item.id)"
          >{{item.title}}</a>
        </div>
      </div>
    </div>
    <!-- 图片列表区域 -->
    <ul class="ptoto-list">
      <router-link :to="'/home/photoinfo/' + item.id" v-for="item in list" :key="item.id" tag="li">
        <img v-lazy="item.img_url" />
        <div class="info">
            <h1 class="info-title">{{item.title}}</h1>
            <div class="info-body">
                {{item.zhaiyao}}
            </div>
        </div>
      </router-link>
    </ul>
  </div>
</template>

<script>
import mui from "../../lib/mui/js/mui.js";

export default {
  data() {
    return {
      cates: [], //所有分类的列表
      list:[], //图片列表的数组
    };
  },
  created() {
    this.getAllCategory();
    this.getPhotoListByCateId(0);
  },
  mounted() {
    // 当组件中的DOM结构被渲染好并放到页面中后执行的钩子函数
    // 如果要操作元素,最好在mouted里面,因为在这时的DOM是最新的
    mui(".mui-scroll-wrapper").scroll({
      deceleration: 0.0005 //flick 减速系数，系数越大，滚动速度越慢，滚动距离越小，默认值0.0006
    });
  },
  methods: {
    getAllCategory() {
      //获取所有图片分类
      this.$http.get("api/getimgcategory").then(result => {
        if (result.body.status == 0) {
          result.body.message.unshift({ title: "全部", id: 0 });
          this.cates = result.body.message;
        }
      });
    },
    getPhotoListByCateId(cateId){
        //根据分类Id获取图片列表
        this.$http.get('api/getimages/' + cateId).then(result => {
            if(result.body.status == 0){             
                this.list = result.body.message
            }
        })
    }
  }
};
</script>

<style lang="scss" scoped>
* {
  touch-action: pan-y;
}

//
.ptoto-list{
    margin:0;
    padding:10px;
    list-style:none;
    padding-bottom:0;
    li{
        background:#ccc;
        text-align: center;
        margin-bottom:10px;
        box-shadow: 0 0 9px #999;
        position: relative;
        img{
            width:100%;
            height:100%;
            vertical-align: middle;
        }
        img[lazy=loading] {
        width: 40px;
        height: 300px;
        margin: auto;
        }
        .info{
            color:#fff;
            text-align:left;
            position:absolute;
            bottom:0;
            left:0;
            background:rgba(0,0,0,.4);
            max-height:84px;
            overflow: hidden;
        }
        .info-title{
            font-size:14px;
        }
        .info-body{
            font-size:13px;
        }
    }
}
</style>